mysql - Query returning Fatal error: Cannot use object of type QueryResult as array -

hi running own php/mysql application has own users table , imbedded joomla site has own users table, when create new user in app creates associated record in joomla table can manage single sign on. works fine, trying delete user joomla table when delete application, code:

$rstmp = customquery("select id id zzz_users email='".$deleted_values["email"]."'");  $datatmp = db_fetch_array($rstmp);  $id = $rstmp["id"];   //delete joomla tables $sql2 = "delete * zzz_user_usergroup_map user_id='$id'";  customquery($sql2); $sql3 = "delete * zzz_users email='".$deleted_values["email"]."'";  customquery($sql3); 

but returning following error:

fatal error: cannot use object of type queryresult array

help?

instead of access id $id = $rstmp["id"]; should access $id = $datatmp["id"]; on other way trying access query result without using fetch